September 10, 2012 10:15am EDTSeptember 10, 2012 9:32am EDTNew York Yankees first baseman Mark Teixeira will undergo an MRI exam today on his reinjured calf. The results could determine whether the slugger plays again this season.

The New York Yankees' recent favorable injury updates took a turn in the wrong direction Sunday when manager Joe Girardi said first baseman Mark Teixeira is out until at least Thursday and likely longer—possibly even for the rest of the season.

Teixeira will have another MRI on his strained left calf today in New York, the New York Daily News reported. The results will go a long way in determining when—or if—the first baseman will return this season.

As Teixeira suspected, he reinjured his left calf when he charged to first base in an attempt to avoid grounding into a game-ending double play Saturday night with the tying run on third. He was playing in his first game since the injury first sidelined him Aug. 27.

“I thought I could play on it at 80 percent or whatever it was,” Teixeira said, according to the Daily News. “I couldn’t, so when I come back next time - whether it’s two days or a week, whatever it’s going to be, I don’t know how long it’s going to be. I’ll just make sure that it’s better than 80 percent.”

Replays showed Teixeira beat the throw with a dive into first but still was called out. His postgame criticism of umpire Jerry Meals likely will result in a fine. His effort to reach base could leave the Yankees without their switch-hitting slugger for the stretch.

Small consolation: Umpiring crew chief Mike Winters had said the one replay he saw was inconclusive. By Sunday, the umpires had to have seen enough replays to know they blew the call, but they declined a request to speak with reporters before the game, the Daily News reported.

“Maybe they got a bad angle,” Girardi said, according to the newspaper. “That’s all I can say to that.”

More important, when asked if Teixeira could be back soon, Girardi told reporters, “No, I don’t think he’ll be a player for us. I’d be surprised, but we’ll just have to wait and see.

"We missed him for 10 games. Now we're going to miss him for more. We need other guys to pick up the slack."

Steve Pearce was at first base Sunday for the Yankees.

Girardi said Teixeira likely wouldn't play in the three-game series against the Boston Red Sox that starts Tuesday, meaning Friday against the Rays would be the earliest he would return.

The Yankees, in a tight race with the Baltimore Orioles and Tampa Bay Rays, are hoping left-hander Andy Pettitte and right-hander Ivan Nova will rejoin their rotation soon. Pettitte, returning from a broken left ankle, told reporters he felt strong after pitching a simulated game Saturday. He could be back this week.

Nova has been cleared by team doctors from a bout with shoulder soreness and could start as soon as Wednesday against the Red Sox.

Lefty CC Sabathia, meanwhile, continues to say his left elbow is not the reason he has struggled lately, but scouts who have seen him think he is pitching at less than 100 percent.

“It looks like his elbow is barking to me,” one scout said. “He’s having trouble being able to finish his pitches.”